Mechanism for car trucks



July 13 1926.

1,592,320 1.. E. YoumE MECHANISM FOR CAR TRUCKS Filed June 16 1925 2 Sheets-Sheet 1 J w/nbdz July 13 1926.

L...E. YOUNIE MECHANISM FOR cm TRUCKS Filed June 16, 1925 2 Sheets-Sheet 2 o vl/ar IIIIIIH llllll l Patented July 13, 1926.

UN'ETED .sra

Tliid Lewis a. rennin, or PORTLAND, GREGON.

MECHANISM ron CAR ravens.

Application filed June 16, 1925. Serial No. 37,490.

This invention is designed to improve the mechanism for are encountere car trucks and is d. The invention involves a finid actuated lift betweenthe; frames car rled by the wheels and the bolster and an arrangement of bolster so that brake shoes carried by the so long as the flu d-actuated lift is in operation and supports the bolster the brake shoes are maintained out of engagement but as the fluid is exhausted from the lift the full weight ofthe load through the lowering of the holster is deliveree through the brake shoes directly to the brake.

The amount of braking may, of

course, be regulated by relieving a greater or less amount of the fluid pressure on the lift. In order turns the side frames swivelled on the bolster. Features an to readily take care of sharp of the truck are d details of the invention will appear from the specification and claims.

The invention is illustrated in the accompanying drawings as follows Fig. 1 truck supplied Fig. 2 an end View, partly in section, on

Shows a plan View of a logging with I the braking mechanism;

the line 2-2 in Fig. 1. y I Fig. 3 a side elevation, partly in section,

on the line 3- 3 in Fig. 1.

1 marks the the truck, 3- axles on track rails,

the wheels, and 4 journal bearings for the axles.

5 marks the comprising be wheels resting being connects 6 has a flange side frames, these side frames ams 5 at each side of the on the bearings, these beams d by a strap 5?. 'A cylinder 7 which is mounted between the beams 5 the flange resting on the tops of the beams.

A bolster 8 9, top channels is made up of the side webs 10 the side frames 5. Angle plates 11 are vertically arranged on and secured to extend from the lower the ends of the webs 9 the channels 10. Channels 13 sides of the webs 8 and are connected with the channels 10 by the posts, or connecting frames 14:. Pistons 15 operate in the ing flanges 16 cylinders 6, the pistons havwhich are secured to the under sides of the channels 10. The pistons and cylinders form tween the bols a swivelled connection beters and side frames permitparticularly useful where steep grades ans. sharp turns.

' pipes 17 leading cylinders 6, saidpipes being connected with 2 the wheels of shoe carried by the bolster;

which are secured between. the side webs 9 and extend outwardly overting a slightswinging movement of the side frames relatively'rto the bolsters so that they may swing to conform to inequalities in the track. J lhus the truck will follow readily a rery uneven track.

Fluid under pressure is supplied through through the pistons to the the train pipe 18.

Brakeshoes 19 are secured to the lower sides of the channels 13 and are arranged directly over the tracks.

There is a slight clearance between the topsof the channels and the bottoms of the side frames so that when the pressure is on the cylinders, the pistons are lifted carrying the bolster 8 upwardly bringing the channels 13 into contact with the under sides of the frame and at the same time lifting the brake shoes 19 off the track. The pressure in the cylinders is handled from the train line either with air or a liquid as may be more convenient so that in the normal running the brakes are clear of the track. I When it is deslred to affect the braking action pressure is reduced on the line allowing a part of the weight of the train load to be carried by the direct engagement of the brake shoes with the brake. By completely exhausting the cylinders the entire load may be thrown on the brake shoes thus affecting a maximum braking action.

As shown'the system is adapted to a logy ging truck which has the usual coupling devices 2021.

hat I claim asnew is 1. In a braking mechanism for car trucks, the combination of wheels; side fra nes carried by the wheels; a bolster; a track brake and a fiuid actuated' lift between the side frame and the bolster normallyholding the brake shoe out of braking position and operable to permit the lowering of the brake shoe into engagement.

2.111 a braking mechanism for car trucks, the combination of wheels; side frames carried by the wheels; a bolster; a track brake.

' ment.

3. In a braking mechanism for car trucks, the combination of a pair of Wheels at each side of the truck; a side frame at each side of the truck snppoited by said wheels; a bolster extending across the truck from side frame to side frame; abrake shoe carried by the bolster; and a finid-actuated lift between each side frame and the bolster, normally holding the brake shoe out of broiling position and operable to permit the lowering of the brake shoe into braking position.

4. In a braking mechanism for car trucks, the combination of a pair of Wheels at each side of the truck; a side frame at each side of the truck supported by said Wheels; a bolster extending across the truck from side frame to side frame; a brake shoe carried by the bolster; and a fluid-actuated lift between each side frame and the bolster, normally holding the brake shoe out of braking position and operable to permit the lowering of the brake shoe into braking position, said lift comprising a cylinder and piston forming guiding and swivelled connections between the side frames and the bolster.

5. in a braking mechanism for car trucks, the combination of a pair of Wheels at each side of the truck, said frames carried by the Wheels, said side frames comprising beams each side of the Wheels and a cylinder between the beams; a bolster extending from side frame to side frame, said bolster having a piston extending into the cylinder; and brake shoes carried by the bolster.

6. In a braking mechanism for car trucks, the combination of a pair ofwheels at each side of the truck; side frames mounted on the Wheels; a bolster extending from side frame to side frame, the side frame extending through the ends of the bolster; a lift connection between the bolster and the side frames comprising cylinders and pistons; and brake shoes carried by the bolster.

In testimony whereo-fI have hereunto set my hand.

LElV-IS E. 'YOUNIE. 

